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W77E468 Schematic ( PDF Datasheet ) - Winbond

Teilenummer W77E468
Beschreibung 8 BIT MICROCONTROLLER
Hersteller Winbond
Logo Winbond Logo 




Gesamt 30 Seiten
W77E468 Datasheet, Funktion
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Preliminary W77E468
8 BIT MICROCONTROLLER
Table of Contents--
GENERAL DESCRIPTION ..............................................................................................................................2
FEATURES ......................................................................................................................................................2
PIN CONFIGURATION ....................................................................................................................................3
BLOCK DIAGRAM ...........................................................................................................................................4
PIN DESCRIPTION..........................................................................................................................................5
FUNCTIONAL DESCRIPTION ........................................................................................................................6
PROGRAMMABLE TIMERS/COUNTERS ....................................................................................................54
TIMED ACCESS PROTECTION ...................................................................................................................71
ON-CHIP MTP ROM CHARACTERISTICS...................................................................................................72
ABSOLUTE MAXIMUM RATINGS ................................................................................................................76
DC ELECTRICAL CHARACTERISTICS ......................................................................................................76
AC ELECTRICAL CHARACTERISTICS........................................................................................................78
EXTERNAL CLOCK CHARACTERISTICS ...................................................................................................78
AC SPECIFICATION..................................................................................................................................78
MOVX CHARACTERISTICS USING STRECH MEMORY CYCLES ........................................................79
TYPICAL APPLICATION CIRCUITS .............................................................................................................82
Using External ROM and RAM ...................................................................................................................82
PACKAGE DIMENSIONS..............................................................................................................................83
100-pin QFP ...............................................................................................................................................83
Publication Release Date: January 1999
- 1 - Revision A1






W77E468 Datasheet, Funktion
Preliminary W77E468
Pin Description, continued
SYMBOL TYPE
DESCRIPTIONS
P3.0P3.7 I/O PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have
alternate functions, which are described below:
RXD(P3.0) : Serial Port 0 input
TXD(P3.1) : Serial Port 0 output
INT0 (P3.2) : External Interrupt 0
INT1 (P3.3) : External Interrupt 1
T0(P3.4) : Timer 0 External Input
T1(P3.5) : Timer 1 External Input
P3.6 : General purpose I/O
P3.7 : General purpose I/O
P4.0P4.7 I/O PORT 4: functions as a 8-bit bi-directional I/O port but not bit-addressable.
P5.0P5.7 I/O PORT 5: functions as a 8-bit bi-directional I/O port but not bit-addressable.
P6.0P6.3
I/O PORT 6: functions as a 4-bit bi-directional I/O port but not bit-addressable. The
P6.0 also provides the alternate function WAIT which is the wait state control
signal.
RD O READ STROBE: indicates external data memory read strobe.
WR O WRITE STROBE: indicates external data memory write strobe.
* Note: TYPE I: input, O: output, I/O: bi-directional.
FUNCTIONAL DESCRIPTION
The W77E468 is 8052 pin compatible and instruction set compatible. It includes the resources of the
standard 8052 such as four 8-bit I/O Ports, three 16-bit timer/counters, full duplex serial port and
interrupt sources with two priority levels.
The W77E468 features a faster running and better performance 8-bit CPU with a redesigned core
processor without wasted clock and memory cycles. it improves the performance not just by running
at high frequency but also by reducing the machine cycle duration from the standard 8052 period of
twelve clocks to four clock cycles for the majority of instructions. This improves performance by an
average of 1.5 to 3 times. The W77E468 also provides dual Data Pointers (DPTRs) to speed up block
data memory transfers. It can also adjust the duration of the MOVX instruction (access to off-chip
data memory) between two machine cycles and nine machine cycles. This flexibility allows the
W77E468 to work efficiently with both fast and slow RAMs and peripheral devices. In addition, the
W77E468 contains on-chip 1KB MOVX SRAM, the address of which is between 0000H and 03FFH. It
only can be accessed by MOVX instruction; this on-chip SRAM is optional under software control.
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W77E468 pdf, datenblatt
Preliminary W77E468
A brief description of the SFRs now follows.
PORT 0
Bit: 7 6 5 4 3 2 1 0
P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0
Mnemonic: P0
Address: 80h
Port 0 is an open-drain bi-directional I/O port.
STACK POINTER
Bit: 7 6 5 4 3 2 1 0
SP.7 SP.6 SP.5 SP.4 SP.3 SP.2 SP.1 SP.0
Mnemonic: SP
Address: 81h
The Stack Pointer stores the Scratchpad RAM address where the stack begins. In other words, it
always points to the top of the stack.
DATA POINTER LOW
Bit: 7 6 5 4 3 2 1 0
DPL.7 DPL.6 DPL.5 DPL.4 DPL.3 DPL.2 DPL.1 DPL.0
Mnemonic: DPL
Address: 82h
This is the low byte of the standard 8052 16-bit data pointer.
DATA POINTER HIGH
Bit: 7 6 5 4 3 2 1 0
DPH.7 DPH.6 DPH.5 DPH.4 DPH.3 DPH.2 DPH.1 DPH.0
Mnemonic: DPH
Address: 83h
This is the high byte of the standard 8052 16-bit data pointer.
DATA POINTER LOW1
Bit: 7 6 5 4 3 2 1 0
DPL1.7 DPL1.6 DPL1.5 DPL1.4 DPL1.3 DPL1.2 DPL1.1 DPL1.0
Mnemonic: DPL1
Address: 84h
- 12 -

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